Method for Manufacturing Electrode Body for Non-Aqueous Electrolyte Solution Rechargeable Battery and Method for Manufacturing Non-Aqueous Electrolyte Solution Rechargeable Battery
In a method for manufacturing an electrode body for a non-aqueous electrolyte solution rechargeable battery, when a roll shaping load PL (MPa) corresponds to a load in a roll pressing step at which a difference ΔT between a thickness T 1 mm of the electrode body pressed at 1.2 MPa after the roll pressing step and a thickness T 2 of the electrode body pressed at 0.03 MPa after the roll pressing step is less than or equal to 0.4 mm, a thickness A (μm) of a cathode plate after a cathode applying step, a cathode weight per unit area B (mg/cm 2 ) of a cathode mixture layer applied in a cathode applying step, and a thickness C (μm) of the cathode plate after a cathode pressing step are adjusted so that the roll shaping load PL (MPa) is less than or equal to 11 MPa.
1 . A method for manufacturing an electrode body for a non-aqueous electrolyte solution rechargeable battery, the non-aqueous electrolyte solution rechargeable battery including the electrode body, a non-aqueous electrolyte solution, and a box-shaped battery case accommodating the electrode body and the non-aqueous electrolyte solution, the method comprising:
a cathode applying step of applying a cathode mixture layer on a cathode current collector foil of the electrode body to form a cathode plate;
a cathode pressing step of pressing the formed cathode plate;
a stacking step of stacking the pressed cathode plate and an anode plate, including an anode current collector foil and an anode mixture layer, with a separator formed from a porous resin arranged in between;
a rolling step of rolling the stacked electrode body; and
a roll pressing step of pressing the rolled electrode body to flatten the rolled electrode body,
wherein, when a roll shaping load PL (MPa) corresponds to a load in the roll pressing step at which a difference ΔT between a thickness T 1 mm of the electrode body pressed at 1.2 MPa after the roll pressing step and a thickness T 2 of the electrode body pressed at 0.03 MPa after the roll pressing step is less than or equal to 0.4 mm,
a thickness A (μm) of the cathode plate after the cathode applying step, a cathode weight per unit area B (mg/cm 2 ) of the cathode mixture layer applied in the cathode applying step, and a thickness C (μm) of the cathode plate after the cathode pressing step are adjusted so that the roll shaping load PL (MPa) is less than or equal to 11 MPa.
2 . The method according to claim 1 , wherein, in the roll pressing step, the rolled electrode body is pressed at room temperature without heating the electrode body.
3 . The method according to claim 1 , wherein the cathode mixture layer includes a conductor, and the conductor includes carbon nanotubes.
4 . The method according to claim 1 , wherein the non-aqueous electrolyte solution rechargeable battery is a lithium-ion rechargeable battery.
5 . A method for manufacturing a non-aqueous electrolyte solution rechargeable battery, the method comprising:
the method for manufacturing an electrode body for a non-aqueous electrolyte solution rechargeable battery according to claim 1 .
6 . A method for manufacturing an electrode body for a non-aqueous electrolyte solution rechargeable battery, the non-aqueous electrolyte solution rechargeable battery including the electrode body, a non-aqueous electrolyte solution, and a box-shaped battery case accommodating the electrode body and the non-aqueous electrolyte solution, the method comprising:
a cathode applying step of applying a cathode mixture layer on a cathode current collector foil of the electrode body to form a cathode plate;
a cathode pressing step of pressing the formed cathode plate;
a stacking step of stacking the pressed cathode plate and an anode plate, including an anode current collector foil and an anode mixture layer, with a separator formed from a porous resin arranged in between;
a rolling step of rolling the stacked electrode body; and
a roll pressing step of pressing the rolled electrode body to flatten the rolled electrode body,
wherein when a cathode density change amount ΔPD (g/cm 3 ) is obtained from Equation 1 , where A (μm) represents a thickness of the cathode plate after the cathode applying step, B (mg/cm 2 ) represents a cathode weight per unit area of the cathode mixture layer applied in the cathode applying step, C (μm) represents a thickness of the cathode plate after the cathode pressing step, and D (μm) represents a thickness of the cathode current collector foil,
Cathode
Density
Change
Amount
Δ
PD
(
g
/
cm
3
)
=
B
×
10
C
-
D
-
B
×
10
A
-
D
(
Equation
1
)
the thickness A (μm) of the cathode plate after the cathode applying step, the cathode weight per unit area B (mg/cm 2 ), the thickness C (μm) of the cathode plate after the cathode pressing step, and the thickness D (μm) of the cathode current collector foil are adjusted so that the cathode density change amount ΔPD is less than or equal to 1.0 g/cm 3 .
7 . The method according to claim 6 , wherein the thickness A (μm) of the cathode plate after the cathode applying step, the cathode weight per unit area B (mg/cm 2 ), the thickness C (μm) of the cathode plate after the cathode pressing step, and the thickness D (μm) of the cathode current collector foil are adjusted so that the cathode density change amount ΔPD is greater than or equal to 0.63 g/cm 3 .
8 . The method according to claim 6 , wherein, in the roll pressing step, the rolled electrode body is pressed at room temperature without heating the electrode body.
9 . The method according to claim 6 , wherein the cathode mixture layer includes a conductor, and the conductor includes carbon nanotubes.
10 . The method according to claim 6 , wherein the non-aqueous electrolyte solution rechargeable battery is a lithium-ion rechargeable battery.
11 . A method for manufacturing a non-aqueous electrolyte solution rechargeable battery, the method comprising:
the method for manufacturing an electrode body for a non-aqueous electrolyte solution rechargeable battery according to claim 6 .